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11.7W Digital Input Class DG Amplifier with I/V Sense and Ultra-Low Quiescent Power

Filterless, Wide-Supply Amplifier with Ultra-Low Noise

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • Wide Input Supply Range (3.0V to 14V)
  • Class-DG Operation Enables Industry Leading Quiescent Power
    • 16mW at VPVDD = 3.8V
    • 15mW at VPVDD = 12V
  • Ultra-Low Noise Floor
    • 11µVRMS Output Noise
    • 116dB Dynamic Range
  • Low Distortion
    • -83dB THD+N at 2W into 8Ω, f = 1kHz and 3kHz
    • -77dB THD+N at 2W into 8Ω, f = 6kHz
  • Output Power at 1% THD+N:
    • 7.7W into 8Ω, VPVDD = 12V
    • 11.7W into 4Ω, VPVDD = 12V
  • Speaker Amplifier Efficiency:
    • 88% at 5W into 8Ω, VPVDD = 12V
  • Class-D EMI Reduction Enables Filterless Operation
    • Spread-Spectrum Modulation
    • Switching Edge Rate Control
  • Integrated Speaker Current and Voltage Sense Requires no External Components
  • I2S/16-Channel TDM and I2C Digital Interfaces
  • Playback and IV Paths Support Sample Rates up to 96kHz
  • Dynamic Headroom Tracking (DHT) Maintains a Consistent Listening Experience
  • Extensive Click-and-Pop Suppression
  • 28-Bump WLP (1.62mm x 2.88mm x 0.5mm, 0.4mm Pitch)

Applications/Uses

  • Mobile Speakers
  • Notebook Computers
  • Smart IoT
  • Smart Speakers
  • Soundbars
  • Tablets

Description

The MAX98395 is a 11.7W high-efficiency, mono Class-DG speaker amplifier with industry leading quiescent power and a wide supply range that can even support single cell Li+ batteries or an external boost. MAX98395 also features current and voltage sense (I/V sense) and dynamic headroom tracking (DHT). Precision output current and voltage monitoring (I/V sense) enables speaker protection algorithms to be run by a host device. Spread spectrum modulation (SSM) and edge rate control minimize EMI and eliminate the need for the output filtering found in traditional Class-D devices.

To achieve industry-leading quiescent power, the Class-DG amplifier employs two supply rails, VBAT and PVDD, to supply the speaker amplifier. Additionally, as the power-supply voltage varies due to sudden transients and declining battery life, DHT automatically optimizes the headroom available to the Class-DG amplifier to maintain consistent distortion and listening levels. The DHT block provides both a dynamic range compressor (DRC) and a limiter that can operate as either a signal distortion limiter (SDL) or standard signal level limiter (SLL).

The device provides a PCM interface for audio data and a standard I2C interface for control data communication. The PCM interface supports audio playback using I2S, left-justified, and TDM audio data formats. In TDM mode, the device can support up to 16 channels of audio data. A unique clocking structure eliminates the need for an external master clock for PCM communication, which reduces pin count and simplifies board layout.

Thermal-foldback protection ensures robust behavior when the thermal limits of the device are reached. When enabled, it automatically reduces the output power when the temperature exceeds a user-specified threshold. This allows for uninterrupted music playback even at high ambient temperatures. Traditional thermal protection is also available in addition to robust over-current protection.

The device is available in a 0.4mm pitch, 28-bump wafer-level package (WLP). The device operates over the extended -40°C to +85°C temperature range.

Simplified Block Diagram

MAX98395: Simplified Block Diagram MAX98395: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .